Journal
ENGINEERING GEOLOGY
Volume 124, Issue -, Pages 47-58Publisher
ELSEVIER
DOI: 10.1016/j.enggeo.2011.10.002
Keywords
Thermo mechanical failure; Undrained heating; Shear band; Permeability; Boom clay
Funding
- European project TIMODAZ [F16W-CT-2007-036449]
- Ecole des ponts ParisTech
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In this study the effect of the temperature increase on the hydro-mechanical properties of sheared Boom clay samples is investigated. Two samples of Boom clay are resaturated in a new hollow cylinder triaxial cell with a short drainage path and then sheared by performing an axisymmetric triaxial loading. The effect of the undrained heating under deviatoric stress is studied on the first sample. It is shown that undrained temperature increase leads to an increase of pore water pressure and consequently to a decrease of the effective mean stress which brings the sample to failure. For an initially sheared sample, the failure occurs along the existing shear band which behaves as a weakness plane in the sample. The responses of the local strain measurement transducers clearly show the sliding of rigid blocks when failure occurs in the sample. The effect of the presence of a shear band on the permeability of the other Boom clay sample is investigated at ambient temperature and at 80 degrees C. It is shown that the presence of a shear band does not affect significantly the permeability. These results confirm the good self sealing properties of Boom clay at ambient and at high temperature. (C) 2011 Elsevier B.V. All rights reserved.
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